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The specific problems of the disconnection of HVDC breakers need an analysis of performances at laboratory scale. In the study of hybrid circuit breakers with commutation, three steps are necessary: modeling, simulation and experimental tests. The paper presents a modeling procedure for a hybrid commutation breaker intended to operate using resonant circuits phenomenon. Using the Matlab platform,...
The paper presents a few issues generated in low voltage distribution grids at the end user's level, by power system harmonics. The introductory section presents shortly harmonics sources, their analysis, effects and measurement methods, appealing mainly to the limits depicted in the specific standards. The following section presents two case studies of power electronics equipment drawing high distorted...
In recent decades the theoretical and experimental study of transient phenomena regarding power transformers has experienced a great development. Results of these studies allowed the elucidation of the main theoretical and practical aspects of the transient phenomena due to propagation of impulse voltages inside the transformers. These studies increased the safe operation of power transformer and...
The paper presents the assessment of electromagnetic compatibility of adjustable drives used in residential air conditioning systems (i.e. air handling units, systems that conserve a significant amount of energy, while maintaining indoor comfort) with a particular stress on brushless DC motors. In the introductory section, a recall of the new smart power modules, that drive centrifugal fans provided...
This paper aims to develop and update the methodology for calculating the stress to which the internal insulation of power transformer is subjected during lightning impulse test. Power transformer internal isolation consists of insolating intervals of oil impregnated paper, transformer board and oil. In whole, the transformer's insulation must withstand the voltage testing levels prescribed by the...
The paper tries to structure, from the technical point of view, the concept of electromagnetic biocompatibility, versus electromagnetic compatibility. There are many resemblances, but also many differences between the two concepts, mainly in the approach, in the frequency range of interest, in the mechanisms and the levels of electromagnetic interference, some of them, pointed in the paper. The paper...
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